Samsung Microwave Error Code E-29

E-29 is a sensor open error indicating the main control board cannot detect a valid signal from the temperature sensor. The board reads an open circuit where the thermistor connection should be, which prevents normal sensor-based cooking operation. This can be caused by a loose connector, damaged wiring, or a failed sensor component.

No, you should not attempt to use the microwave while E-29 is active. The error indicates the control board cannot monitor cavity temperature, which means sensor-driven cooking cycles cannot operate safely or accurately. The microwave will typically refuse to start in this condition as a protective measure.

Repair costs vary depending on the cause. If the fix is simply reseating a connector, professional labor may cost between $75 and $150 for a service call. Replacing the temperature sensor typically adds a modest parts cost on top of labor. If the main PCB has failed, the total repair cost could range from $150 to $300 or more, at which point comparing the repair cost to the price of a replacement unit is worth considering.

Some E-29 errors are caused by a simple disconnected connector, which a careful DIYer can address by unplugging the microwave, locating the sensor harness, and reseating the connector at the PCB. However, working inside a microwave involves high-voltage components including the capacitor, which can retain a lethal charge even when unplugged. If you are not experienced with high-voltage appliance repair, professional service is strongly recommended.

Unplugging the microwave for a minute and restoring power may temporarily clear the displayed error, but E-29 will return immediately if the underlying sensor circuit problem is still present. A reset does not fix a disconnected harness, broken wire, or failed thermistor. The root cause must be diagnosed and corrected for the error to stay cleared.